Multi-output power supply device

Abstract

In a multi-output power supply device, a low-load main circuit supplies power to a low-voltage load portion from a main battery by employing at least one of batteries constituting a battery series body as the main battery. A low-load sub circuit supplies power to the low-voltage load portion from sub batteries by employing the batteries different from the main battery as the sub batteries out of the batteries constituting the battery series body. A flyback converter is a converter provided in the low-load sub circuit and capable of transforming a voltage. A controller controls driving of the flyback converter to supply power to the low-voltage load portion via the flyback converter from the sub batteries when the main battery is abnormal.

What is claimed is: 
     
         1 . A multi-output power supply device comprising:
 a battery series body in which a plurality of batteries are connected in series;   a high-load main circuit configured to supply power to a high-voltage load portion from the battery series body;   a low-load main circuit configured to supply power to a low-voltage load portion, a drive voltage of which is lower than the high-voltage load portion, from a main battery by employing at least one of the batteries constituting the battery series body as the main battery;   a low-load sub circuit configured to supply power to the low-voltage load portion from a sub battery by employing a battery different from the main battery as the sub battery out of the batteries constituting the battery series body;   a DC/DC converter provided in the low-load sub circuit and capable of transforming a voltage; and   a controller configured to control the DC/DC converter, wherein   the controller controls driving of the DC/DC converter to supply power to the low-voltage load portion via the DC/DC converter from the sub battery when the main battery is abnormal.   
     
     
         2 . The multi-output power supply device according to  claim 1 , wherein
 a plurality of the DC/DC converters and a plurality of the sub batteries are provided,   the DC/DC converters are provided corresponding to the respective sub batteries, and   when the main battery is abnormal and some of the DC/DC converters are abnormal, the controller controls driving of the normal DC/DC converter to supply power to the low-voltage load portion via the normal DC/DC converter from the sub battery.   
     
     
         3 . The multi-output power supply device according to  claim 1 , wherein
 a plurality of the DC/DC converters and a plurality of the sub batteries are provided,   the DC/DC converters are provided corresponding to the respective sub batteries, and   when the main battery is abnormal, the controller controls driving of all the normal DC/DC converters to supply power to the low-voltage load portion via the respective DC/DC converters from the corresponding sub batteries, allowing the respective sub batteries to jointly supply power required for the low-voltage load portion.   
     
     
         4 . The multi-output power supply device according to  claim 2 , wherein
 a plurality of the DC/DC converters and a plurality of the sub batteries are provided,   the DC/DC converters are provided corresponding to the respective sub batteries, and   when the main battery is abnormal, the controller controls driving of all the normal DC/DC converters to supply power to the low-voltage load portion via the respective DC/DC converters from the corresponding sub batteries, allowing the respective sub batteries to jointly supply power required for the low-voltage load portion.   
     
     
         5 . The multi-output power supply device according to  claim 1 , wherein
 the controller controls the DC/DC converter according to a normal mode in which the low-load main circuit supplies power to the low-voltage load portion by preferentially using the main battery when the low-load main circuit and the low-load sub circuit are normal, a sub battery power consumption mode in which the low-load sub circuit supplies power to the low-voltage load portion by preferentially using the sub battery when the low-load main circuit and the low-load sub circuit are normal, and an abnormal mode in which the low-load sub circuit supplies power to the low-voltage load portion when the low-load main circuit is abnormal and the low-load sub circuit is normal.   
     
     
         6 . The multi-output power supply device according to  claim 2 , wherein
 the controller controls the DC/DC converter according to a normal mode in which the low-load main circuit supplies power to the low-voltage load portion by preferentially using the main battery when the low-load main circuit and the low-load sub circuit are normal, a sub battery power consumption mode in which the low-load sub circuit supplies power to the low-voltage load portion by preferentially using the sub battery when the low-load main circuit and the low-load sub circuit are normal, and an abnormal mode in which the low-load sub circuit supplies power to the low-voltage load portion when the low-load main circuit is abnormal and the low-load sub circuit is normal.   
     
     
         7 . The multi-output power supply device according to  claim 3 , wherein
 the controller controls the DC/DC converter according to a normal mode in which the low-load main circuit supplies power to the low-voltage load portion by preferentially using the main battery when the low-load main circuit and the low-load sub circuit are normal, a sub battery power consumption mode in which the low-load sub circuit supplies power to the low-voltage load portion by preferentially using the sub battery when the low-load main circuit and the low-load sub circuit are normal, and an abnormal mode in which the low-load sub circuit supplies power to the low-voltage load portion when the low-load main circuit is abnormal and the low-load sub circuit is normal.